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  1. The sum of seven numbers is 235. The average of the first three is 23 and that of the last three is 42. The fourth number is ?
    1. 40
    2. 126
    3. 69
    4. 195
Correct Option: A

Sum of 7 numbers = sum of first 3 numbers + N4 + sum of last 3 numbers.
(23 x 3) + N4 + (42 x 3) = 235
⇒ N4 = 40
∴ 4th number = 40


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